Module 3
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (24 张)
Parts of Mature Seed (3)
Seed Coat Cotyledon(s) Embryonic Axis
Parts of the Embryonic Axis (3)
Plumule Radicle Hypocotyl
Rudimentary leaf of the embryo of the seed plant that could either remain or emerge upon germination
Cotyledon
Protective outer covering of a seed • Derived from outer integument of the ovule • Smooth, thick and impermeable • Brownish in color • Plays a role in seed dormancy
Testa (Endo- and Exo-)
Protective inner layer of the seed • Derived from inner integument of the ovule • Thin and membranous • White or hyaline in color • Protects embryo from dehydration and mechanical damage
Tegmen (Endo- and Exo-)
Part of the embryonic axis that projects above the cotyledon
Epicotyl
Portion between cotyledon and radicle
Hypocotyl
Composed of epicotyl, young leaves, and SAM
Plumule
Embryonic Root
Radicle
Food reserve in monocots
Endosperm, absorbed by the scutellum (single cotyledon)
Main differences of non-endospermic seed from endospermic seed (4)
• Absent endosperm • Food stored in cotyledons • Thick and fleshy cotyledons • Perisperm form nucellus
Sum of events that begins with hydration of the seed and culminate in emergence of the embryonic axis (usually the radicle) from the seed coat
Seed Germination
Two types of germination
Epigeal and Hypogeal
Characteristics of Epigeal Germination (2)
• Cotyledons emerge form soil w/ plumule • Hypocotyl Elongates and forms hook for foliage expansion
Characteristics of Hypogeal Germination (2)
• Cotyledons remain in soil • Epicotyl elongates pushing plumule out to form hook with plumule pointing downward
2 sheaths enclosing the embryo and their funcitons
Coleorhiza - Covers the radicle Coleoptile - Covers the shoot
2 main types of root systems
Tap root and Fibrous
Taproots are defined by
Large downward vertical primary root from which secondary roots arise
Fibrous roots are:
Also called adventitious roots Located close to soil surface Dense network of roots In areas with abundant water
True or False: A plant can both be fibrous and tap
True.
Types of root modifications based on physiological functions (8)
Storage Aerial Assimilatory Reproductive Respiratory Epiphytic Saprophytic Parasitic
Type of root based on mechanical functions (7)
Prop Stilts Buttress Climbing Contractile Floating Root-thorns
Type of root present in mangroves, allows for gas exchange
Pneumatophores, Stilts
Types of storage tap root (4)
Conical Fusiform Napiform Tuberous